Parallel Connection For Redundancy - Siemens SITOP PSU8200 Manual

9.2

Parallel connection for redundancy

Connecting several SITOP PSU8200 power supplies in parallel for redundancy purposes is
required if especially high demands are placed regarding the availability of a reliable 24 V
power supply.
Using the SITOP PSE202Uredundancy module, two 24 V power supplies of the same type
up to 20 A can be decoupled (Figure 9-2 Redundant configuration with two power supplies
and SITOP PSE202U redundancy module (Page 57)). When one of the devices fails, then
the other automatically takes over the power supply. If one of the power supplies fails, then
this is signaled using an LED on the redundancy module as well as an isolated relay contact.
When dimensioning the system, it must be ensured that n+1 redundant connected power
supplies can handle the total power requirement of the remaining n power supplies.
Note
For a high reliability of the supply, it is recommended that the redundant switched
power supplies are fused separately on the line-side and, if possible, connected to different
power supply networks.
Figure 9-2
You can find additional information in the:
SITOP PSE202U manual (http://support.automation.siemens.com/WW/view/en/42248598)
SITOP PSU8200 1ph
Manual, 11.2014, C98130-A7633-A1-3-7629
Redundant configuration with two power supplies and SITOP PSE202U redundancy
module
9.2 Parallel connection for redundancy
Applications
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